docs: def scheduler(rq, ctx, verbose, burst, queue, interval, pid):
      "Periodically checks for scheduled jobs."
      scheduler = rq.get_scheduler(interval=interval, queue=queue)
      if pid:
          with open(os.path.expanduser(pid), 'w') as fp:
              fp.write(str(os.getpid()))
      if verbose:
          level = 'DEBUG'
      else:
          level = 'INFO'
      setup_loghandlers(level)
      scheduler.run(burst=burst)